.app-header {
  width: 100%;
  height: 0.42rem;
  line-height: 0.42rem;
  font-size: 0.14rem;
  color: #333;
  background: #fff;
  text-align: center;
  border-bottom: 1px solid #efefef;
  .arrow-left {
    float: left;
    width: 0.18rem;
    height: 0.18rem;
    background: url("./img/return.png") no-repeat;
    background-size: cover;
    margin: 0.12rem 0 0 12px;
  }
  .title{
    position: absolute;
    left: 44%;
    top: 0;
  }
}